"Look" good? That's nice, but hardly definitive. Start it up and squirt some carburetor cleaner at the hoses, especially the ends. If the engine doesn't pick up a few RPM's, then the lines are good. Before you go swapping out a TCV, cap/rotor/wires/plugs/filters are recent? Good point on ...

Thanks. Found it. Checked all three lines and they look good. Anyone have any comments before I buy the control valve. Like I said, its surging under load. If I acclerate slowly, I don't notice it. But if I try to accelerate quickly, it surges. It still goes but i get a constant repetetive surge as ...

My 2004 xc90 has a surge when accelerating. After searching for a while, it sounds like its probably the boost control valve. Can anyone point me to where this is at and/or how to replace it. I'm a fairly experienced self proclaimed shadetree mechanic but this is my first volvo and I can't find a re...